Perhaps you should try some spelling variations:
"mechanical engineers" » "mechanical engineering"
"electrical engineers" » "electrical engineering", "chemical engineers", "electrical engineer'ss", "electrical engines", "electrical engineerings"
"electrical engineer" » "electrical engineer's", "electrical engine", "electrical engineering"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("electrical engineer") OR ((("electrical engineers") OR ("mechanical engineers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"electrical engineer\") or (((\"electrical engineers\") OR (\"mechanical engineers\"))))".
• Removing quotes may allow a broader search: (( electrical engineer ) or ((( electrical engineers ) OR ( mechanical engineers )))).
• Adding a wildcard symbol may retrieve word variants: (("electrical engineer") or ((("electrical engineers") OR ("mechanical engineers"))))*.